Attachment for middlings-purifiers.



Dr DBNEEN. l ATTACHMENT FOR MIDDLINGS PURIFIERS.

APPLIUATIO FILED APB.. 15, 1907.

Patented Feb'. 16, 1909.

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DENNIS DENEEN, OF GLEXCOE, MINNESOTA.

ATTACHMENT FR IffIIDDLINGS-PURIFIERS.

Specification of Letters Patent.

Patented Feb. 16, 1909.

Application filed April 15, 1907. Serial No. 368,418.

To all whom it may concern:

Be it known that l, DENNIS Denman, ot' Glencoe, McLeod county, Minnesota, have invented certain new and useful improvements in Lattachments for Middlings-Purifiers, of which the following is a specification.

The object ot' my invention is to provide an apparatus by means of which the dust and fine material may be lifted out ot' the middling stock and g'aded and discharged from the machine without danger otl becoming again mixed with the stock or deposited upon the sieve.

The invention consists generally in various constructions and combinations, all as hereinafter described and 'particularly pointed out in the claims.

ln t-he accoi'i'ipanying drawings, Yttn'ming part ot this specification, the figure-represents a longitudinal vertical sectional view ot' a middlings purifier attachment embodying my invention.

ln the drawing. 2 represents the upper portion of a middlings purifier having the usual horizontal reciprocating` sieve 3 operated in the usual way from the shaft -l and composed of meshes of dirlerent degrees ot iineness for the purpose ot grading the iniddlings as usual in a machine of this type. .-r spout 5 is provided at one end of the inachine into which the tailings or shorts from the sieve arc discharged. Above the casing 2 and supported thereon, is a casing t3 w 1erein the apparatus embodying` my invention is arranged, and which I will now proceed to describe in detail. A plate T is provided in one end ot said casing extending from the top thereo't and converging` toward one end to forma hopper S into which the material is discharged from the break machi es through a spout 9. A feed roll is provided at the lower edge of the plate 7 and a hinged valve 11 operated by a stem and handle device 12 enables the operator to increase or decrease the feed opening at the bottom of the hopper in the usual way. The material from the hopper falls upon the receiving' end of the sieve 3 and is gradually worked along thereover by the reciprocation of the sieve.

Vithin the chamber formed by the casing G I provide upright plates 13 and 14 spaced from the sieve and from the top of the casing. Inclined plates 15 and 16 are also provided and also spaced from the sieve and the top or' the casing`r and converging toward the lower edges of the plates 18 and torming chambers 16 and 17 which are open at the top and closed at the bottom between the inclined and upright plates by means oi [horizontal conveyers 18 which receive the material from the chambers and deliver it outside oil said casing. These conveyers are operated in any suitable way,l which it is not necessary to illustrate herein.

y'lhe spaces between the plates and 13, 1l and 15 and the end wall of the casing and the plate 1G, gradually contract toward the top ot' the casing owing to the arrangement ot' the plates, until at the upper edges ot said plates a series oit narrow throats 19` 2() and 2l are formed. and the currents oi.

i air drawn up through the sieve and into the spaces between the chambers will, as they approach the throats7 be contracted and will increase in :torce as they pass through 'the narrow throats and through the space between the upper edges of the walls of the chambers and the top of the casing. The top ot the casing has openings 22 and therein provided with valves 2-1 and having adjusting devices 26 by means of which the valves may be set in any desired position to increase or decrease the size ot' the openings. .ein air trunk 2T is termed by the casii 2S above the chambers and over the openings 22 and .l-l, and a casing 29 incloses a suction. tan 30 located between the openy 22 and 23 and communicating through the air trunk with the interior of the casing t. This tan is driven by any suitable means and has a spout 31 leading to a dust chan ber, not shown.

In the operation or the machine currents of air will be established through the sieve and the material thereon of suflicientstrength to lift the dust and liner particles up into the spaces between the walls of the chambers 16 and 1T and as the air currents pass through the throats between said walls and flow over the open tops of the chambers the heavier particles will be precipitated by gravity into the chambers and the conveyers therein and be discharged out of the machine. The successive chambers will have the effect of grading the material, one chamber catching the coarser grade of the particles suspended in the air currents, while the next chamber will receive the material that was carried by the air currents over the first chamber. The dust will be carried along through the fan to the dust chamber. By means of the valves leading to the air trunk the suction of the -fan can be regulated according to the character of the material that is passing through the machine and the degree of separation desired.

W'ith this apparatus the material lifted by the air currents from the middlings can be graded very successfully and thoroughly and discharged from the machine, and there will be no possibility of the separated material or dust becomin again mixed with the puriiied stock.

I claim as my invention:

l. In a middlings purifier, the combination, with a reciprocating sieve, of a casing supported above the same, upright plates arranged transversely in said casing, inclined plates also arranged transversely in said casing and converging at the bottom toward the lower edges of said upright plates, and said upright plates and inclined plates being spaced from the top of said casing and from said sieve, and narrow throats or passages being formed between said plates and the top of said casing and extending continuously over said plates, transverse conveyers provided in the space between the lower edges of said upright and said inclined plates, and air passages being formed between said inclined plates and the contiguous upright plates, said passages gradually contracting and forming throats between the upper edges of the contiguous plates near the top of the casing, and chambers with open tops being formed between said plates intermediate to said throats or passages, and the top of said casing having openings above said chambers, and valves therefor, anda suction fan having a trunk communicating with said opening and whereby currents ol air will be established up through said throats and across the open tops of said chambers and into said fan through said openings, for the purpose i specified.

2. In the middlings purifier, the combination, with a casing, of a reciprocating sieve supported therein, vertically arranged plates 13 and le extending transversely at intervals in said casing above said sieve, inclined plates 15 and 16 having their lower edges near the corresponding edges of said vertical plates and diver-ging therefrom toward the top oiu the casing and forming settling chambers, transverse conveyers arranged between the lower edges of said plates in the bottom ont said settling chambers, the upper edges of said vertical and inclined plates being separated from the top of said casing by narrow horizontal throats or passages which extend continuously over said chambers, and a narrow vertical throat or passage being formed between said chambers and communicating with the space above said sieve and with said horizontal throats,

and the top of said casing having openings over said chambers and horizontal throats and communicating therewith, a single unobstructed horizontal air trunk mounted on said casing and communicating with said openings, and a fan arranged to draw currents of air through the openings in the top of said casing, the currents of air established by said tan passing up through said sieve and said vertical throats and through said horizontal throats and across said chambers, the heavier particles being precipitated into the chambers and the finer material passing up through said openings into said air trunk.

In witness whereof, I have hereunto set my hand this 10th day of April 1907.

DENNIS DENEEN.

l/Vitnesses RICHARD PAUL, J. B. ERA. 

